Retell AI

Supercharge Your Contact Center Operations with AI Phone Agents

retellai.com

11-50

B2B

Company research

Public company, workplace, funding, and market signals

Updated Aug 16, 2026

Overview

Retell AI is a voice AI agent platform and conversational voice API that helps developers build, test, deploy, and monitor human-like AI phone agents for sales, support, logistics, and contact-center workflows.

Primary product

Voice AI agent platform / conversational voice API

Founded

2023

Headquarters

Redwood City, California, United States

Team size

51-200

Industry

Technology, Information and Internet

Sub-industry

Voice AI / conversational AI / developer platform

Offices

San Francisco, California, United States

Business model

usage-based API pricing

per-minute conversation pricing

enterprise sales

Funding

Stage

Seed

Total raised

$9.4M

Latest round

Seed · Aug 2024

Latest amount

$4.6M

Seed

Aug 2024 · Alt Capital

$4.6M

Pre Seed

Nov 2023 · Y Combinator

$125K

People & investors

Leadership

Sierra M. Young

Co-Founder / CEO

Mikael J. Jorgensen

Co-Founder

Unknown additional leaders from public sources

Founders

Bing Wu

Co-Founder & CEO

Evie Wang

Co-Founder & CMO / CPO

Todd Li

Co-Founder & President

Weijia Yu

Co-Founder & COO

Zexia Zhang

Co-Founder & CTO

Investors

Work & culture

Public materials emphasize speed, reliability, and operator-focused product execution. The company markets a high-performance voice layer, promotes customer implementation support, and appears to be hiring across engineering, growth, partnerships, and legal.

Compensation

No explicit compensation bands were found in the sources reviewed. Active hiring suggests a growing team, but public salary details were not available.

Product & market

Pricing

Per-minute voice agent conversation pricing; likely enterprise/custom pricing for larger deployments.

Differentiators

—~800 ms response time
—Handles interruptions
—Hosted models and optimizations across the API
—Developer-friendly voice agent platform
—Built to deploy quickly, with claims of production-ready voice AI in a day
—Targets real phone workflows rather than generic chat

Technology

Asterisk

Twilio

Plivo

Telnyx

FreeSWITCH

Amazon Connect

Genesys

Dialogflow

OpenAI

PyTorch

React

TypeScript

JavaScript

Python

Terraform

GitHub Actions

Jira

Salesforce

HubSpot

Vanta

Customers

Healthcare

Insurance

Financial services

Logistics

Sales teams

Support teams

Contact centers

Competitors

Bland AI

Vapi

Synthflow

Sierra

PolyAI

Retool Voice/agents adjacent products

Other voice-agent platforms

Scale & contact

Estimated revenue

$10M-$50M ARR (estimated from public claims of ~$35M-$36M ARR in YC job posting; this is a company-reported signal, not independently verified)

Estimated monthly visits

681.6K

Traffic estimate as of Jun 2026

Latest news

Retell AI seed announcement

Retell AI · Aug 2024

Official company announcement of a $4.6M seed round led by Alt Capital with Y Combinator, Carya Venture, and angels participating.

Retell AI lets companies build 'voice agents' to answer phone calls

TechCrunch · May 2024

TechCrunch covered Retell AI’s voice-agent platform, noting hundreds of customers and per-minute pricing.

Y Combinator job posting for Retell AI

Y Combinator

YC job post states Retell reached $35M-$36M ARR and had a 20-24 person team at the time of posting.

Retell AI company page on LinkedIn

LinkedIn company page shows 87 employees, office in Redwood City plus San Francisco presence, and a tech stack list.

About Us API reference Blog Careers Contact sales Dashboard / app Docs Homepage LinkedIn Newsroom

SourcesRetell AI website Retell AI seed announcement LinkedIn company page TechCrunch coverage Y Combinator job post

Jobs and careers at Retell AI

36 jobs at Retell AI

Enterprise Account Manager

On-site

Technical Success

San Francisco Bay Area; Redwood City, California, United States

Today

On-site

Full-time